Boat trailer



FIG. 1 is a left, rear perspective view of a boat trailer showing my newdesign;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof.

The ornamental design for a boat trailer, substantially as shown.